Thread Cutting Jig That Actually Works

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Project by Grumpy posted 02-06-2016 06:01 AM 3396 views 17 times favorited 25 comments Add to Favorites Watch
Thread Cutting Jig That Actually Works
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This is something I have wanted to do for a long time. Now it’s a relatively simple process.
I saw a lot of ideas on youtube and thanks to Brian Brooks I came up with a similar but different idea.
I used my Nova 3000 lathe and accessories as a solid base for the jig.

The jig is in 2 parts. Part 1 is a router support & part 2 holds the work piece & moves an a X and Y axis.

Part 1
At the left hand end I used my large bowl jaw set to hold the back of the router.
The front of the router is supported by a lathe steady bolted to the lathe bed.
It has a plywood piece screwed to it to attach the router.
The lathe centre was critical as an axis for the whole jig.

Part 2, the component that holds the chuck
This is also aligned to the lathe turning centre.

A M30 threaded rod was cut to length. This forms the basis for the thread and is the right size and thread for the chuck.
I tapped 3 1/4” threads in one of the nuts and turned up some handles to rotate the chuck into the router bit.
The router bit is an Enco 3/4” 60 degree included angle high speed steel double angle cutter. The same used by Brian Brooks.
for the back and forth axis I used 1/4” threaded rod fitted to an old umbrella winding handle (pays not to throw some things out).
The tool rest and a clamp helps support the front of the jig.
Note the m30 nut fitted into the jig. That controls the sideways axis and mimics the thread on the work piece.
The locking bar off the tailstock was fitted to a piece of angled steel as a back support.

And here is the result

Pretty neat even if I say so myself.
I am yet to do an internal thread but I don’t see there will be an issue.
Now for screw top lidded boxes. Even nuts and bolts, who knows.
Thanks for looking

Here is Brian Brooks’ jig

-- Grumpy - "Always look on the bright side of life"- Monty Python

25 comments so far

View BurlyBob's profile


3467 posts in 1686 days

#1 posted 02-06-2016 06:44 AM

Holy jig making Batman! That’s way out of my league! You’ve really got something there and I doubt I could come close to it.

View Mark Wilson's profile

Mark Wilson

1694 posts in 484 days

#2 posted 02-06-2016 07:35 AM

I’m sorry, Tony. I’ll have to see it in action to even begin to comprende. Wait here a minute….WOW! I just watched Brian’s video. That’s ingenious. Now, I’m gonna go spend some time, seeing what other lunacy I can imbibe in tonight. WOW!

-- Mark

View majuvla's profile


8700 posts in 2288 days

#3 posted 02-06-2016 07:51 AM

Looks little complicated at first, but I anderstand now. Nice solution.

-- Ivan, Croatia, Wooddicted

View Mark Wilson's profile

Mark Wilson

1694 posts in 484 days

#4 posted 02-06-2016 07:53 AM

This is CRAZY COOL, Tony. Now, I really want a new-fangled, modern lathe that can accommodate such things.

Or, a Universal toolrest banjo for my ancient Shopsmith.
My head’s getting full of all kinds of craziness.

-- Mark

View Theewoodworking's profile


106 posts in 341 days

#5 posted 02-06-2016 12:14 PM

Nice project

My wood project

View Roger's profile


19714 posts in 2225 days

#6 posted 02-06-2016 01:35 PM

LOL… ditto BurlyBob

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

View Mork's profile


250 posts in 2195 days

#7 posted 02-06-2016 02:13 PM

Very cool.

I have a metal lathe and I have often wondered if this type set up would be a better approach.

View doubleDD's profile (online now)


5062 posts in 1464 days

#8 posted 02-06-2016 02:51 PM

This looks to be a great set up. It will take me a little time to understand it all. Sure would love to make one.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View Bobsboxes's profile


1091 posts in 2084 days

#9 posted 02-06-2016 02:54 PM

Way cool, nice work.

-- Bob in Montana. Kindness is the Language the blind can see and deaf can hear. - Mark Twain

View Julian's profile


1010 posts in 2111 days

#10 posted 02-06-2016 03:27 PM

Awesome jig.

-- Julian

View woodcox's profile


1514 posts in 1433 days

#11 posted 02-06-2016 07:46 PM

Bravo. Sir.

-- "My god has more wood than your god" ... G. Carlin.

View DaleMaley's profile


269 posts in 1656 days

#12 posted 02-06-2016 09:01 PM

Nice Job:

I have often thought of how I could do this, and I understand the concept from the video.


-- Dale, Illinois,

View Grumpy's profile


21459 posts in 3272 days

#13 posted 02-06-2016 09:27 PM

Thanks for your feedback jocks. It might need some modification for larger boxes but I don’t see a problem there.
Mark, go for it mate. You don’t really need a lathe to do it but it needs solid support.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View Karson's profile


35032 posts in 3821 days

#14 posted 02-06-2016 09:32 PM

Super cool Tony. A great way to cut threads

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware soon moving to Virginia †

View XquietflyX's profile


287 posts in 381 days

#15 posted 02-06-2016 09:41 PM

awesome job!!!

-- You can tell a lot about your wife by her hands, for example if they are around your throat she's prolly pissed off at you...

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